backupsite: fix form state

dashboard/src/components/BackupSiteAddDialog.vue

@@ -288,7 +288,7 @@ defineExpose({
 
     dialog.value.open();
 
-    // checkValidity();
+    setTimeout(checkValidity, 100); // update state of the confirm button
   }
 });
 
@@ -298,9 +298,9 @@ defineExpose({
   <Dialog ref="dialog" :title="$t('backups.site.addDialog.title')">
     <div>
       <div v-if="step === 'storage'">
-        <form @submit.prevent="onSubmit()" autocomplete="off" ref="form" @change="checkValidity()">
+        <form @submit.prevent="onSubmit()" autocomplete="off" ref="form" @input="checkValidity()">
           <fieldset :disabled="busy">
-            <input style="display: none;" type="submit" :disabled="!isFormValid"/>
+            <input style="display: none;" type="submit"/>
 
             <FormGroup>
               <label for="nameInput">{{ $t('backups.configureBackupStorage.name') }}</label>